Abstract

Nowadays, optical fiber has become the main means of data transmission. However, there are applications where is not possible to use it for various reasons (physical impossibility, cost, design choice). In these cases the data transmission by optical wireless means (Free Space Optics -FSO) is a solution to consider when we have high bandwidths to transmit. The FSO technology works with the same sources as optical fiber transmission, but the transmission channel is not guided (in contrast to an optical fiber). Contrary to radio frequency wireless systems, FSO systems are extremely robust against interference. However, an important problem of this technology are fluctuations in phase and amplitude suffered by the wavefront, these are caused by turbulences of the optical signal when the signal passes through the atmosphere. These fluctuations can cause the SNR that arrives to the opening of the receiver is not good enough to retrieve the information. The solution that this project proposes for correct the fluctuations suffered by the wavefront, is the use of a hybrid system (optical and radio frequency) formed by an array of subapertures. In particular, in this project proposes the use of a programmable Analog Front End equipped with 4 channels (subapertures) that uses a DSP for control the devices that will reconstruct the wavefront to get the maximum SNR possible. The devices

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